Validate email : JavaScript Servlets « Servlets « Java

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Java » Servlets » JavaScript Servlets 




Validate email

/* functions.js
<script language="JavaScript"> 

function CheckEmail(email)
{
    var firstchunk,indx,secondchunk

    if (email == ""){
        alert("Please make sure you have entered a valid email before submitting the info.")

        return false
    }

    //get the zero-based index of the "@" character
    indx = email.indexOf("@")

    //if the string does not contain an @ then then return true
    if (indx == -1 ){

        alert("Please make sure you have entered a valid email before submitting the info.")

        return false
    }

    //if the first part of email is < 2 chars and second part < 7 chars
    //(arbitrary but workable criteria) then reject the input address

    firstchunk = email.substr(0,indx) //up to but not including the "@"

    //start at char following the "@" and include up to end of email addr
    secondchunk = email.substr(indx + 1) 

    //if the part  following the "@" does not include a period "." then
    //also return false
    if ((firstchunk.length < 2 ) || (secondchunk.length < 7) ||
    (secondchunk.indexOf(".") == -1)){ 

    alert("Please make sure you have entered a valid email before submitting the info.")

    return false
}

//the email was okay; at least it had a @, more than 1 username chars,
//more than 6 chars after the "@", and the substring after the "@"
// contained a "." char

return true

}

function CreateWindow(uri) {

    var newWin = window.open(uri,'newwin1','width=500,height=400,resizable,scrollable,scrollbars=yes');
    newWin.focus();



</script>
*/

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ModuleServlet extends HttpServlet {

  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, java.io.IOException {

    response.setContentType("text/html");
    java.io.PrintWriter out = response.getWriter();
    out.println("<html><head>");
    RequestDispatcher dispatcher = request
        .getRequestDispatcher("/WEB-INF/functions.js");
    dispatcher.include(request, response);

    out.println("<title>Client Forms</title></head><body>");

    out.println("<h2>Enter Your Name and Email</h2>");
    out
        .println("<form action=\"/home/displayHeaders.jsp\" name=\"entryForm\" onSubmit=\" return CheckEmail(this.email.value)\">");
    out.println("<table border=\"0\"><tr><td valign=\"top\">");
    out
        .println("First and last name: </td>  <td valign=\"top\"><input type=\"text\" name=\"name\" size=\"20\"></td></tr>");
    out.println("<tr><td valign=\"top\">");
    out
        .println("Email: </td>  <td valign=\"top\"><input type=\"text\" name=\"email\" size=\"20\"></td>");
    out
        .println("<tr><td valign=\"top\"><input type=\"submit\" value=\"Submit\" ></td>");
    out.println("</tr></table></form>");

    out.println("</body></html>");

  //end doGet
}

           
       














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